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1. WO1980001951 - LINEAR DIFFERENTIAL SENSOR OF THE FOUCAULT CURRENT TYPE USED TO MEASURE SHORT DISPLACEMENTS OF A METAL PIECE

Publication Number WO/1980/001951
Publication Date 18.09.1980
International Application No. PCT/FR1980/000034
International Filing Date 11.03.1980
IPC
G01D 5/20 2006.01
GPHYSICS
01MEASURING; TESTING
DMEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED BY A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; TRANSFERRING OR TRANSDUCING ARRANGEMENTS NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
5Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
12using electric or magnetic means
14influencing the magnitude of a current or voltage
20by varying inductance, e.g. by a movable armature
G01D 5/22 2006.01
GPHYSICS
01MEASURING; TESTING
DMEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED BY A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; TRANSFERRING OR TRANSDUCING ARRANGEMENTS NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
5Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
12using electric or magnetic means
14influencing the magnitude of a current or voltage
20by varying inductance, e.g. by a movable armature
22differentially influencing two coils
G01L 9/00 2006.01
GPHYSICS
01MEASURING; TESTING
LMEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
9Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
G01L 9/10 2006.01
GPHYSICS
01MEASURING; TESTING
LMEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
9Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
10by making use of variations in inductance
CPC
G01D 5/202
GPHYSICS
01MEASURING; TESTING
DMEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
5Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
12using electric or magnetic means
14influencing the magnitude of a current or voltage
20by varying inductance, e.g. by a movable armature
2006by influencing the self-induction of one or more coils
202by movable a non-ferromagnetic conductive element
G01D 5/2291
GPHYSICS
01MEASURING; TESTING
DMEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
5Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
12using electric or magnetic means
14influencing the magnitude of a current or voltage
20by varying inductance, e.g. by a movable armature
22differentially influencing two coils
2291Linear or rotary variable differential transformers (LVDTs/RVDTs) having a single primary coil and two secondary coils
G01L 9/0036
GPHYSICS
01MEASURING; TESTING
LMEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
9Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements
0033Transmitting or indicating the displacement of bellows by electric, electro-mechanical, magnetic, or electro-magnetic means
0036using variations in inductance
G01L 9/007
GPHYSICS
01MEASURING; TESTING
LMEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
9Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements
0041Transmitting or indicating the displacement of flexible diaphragms
007using variations in inductance
G01L 9/105
GPHYSICS
01MEASURING; TESTING
LMEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
9Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements
10by making use of variations in inductance ; , i.e. electric circuits therefor
105with temperature compensating means
Applicants
Inventors
Priority Data
790620612.03.1979FR
Publication Language French (FR)
Filing Language French (FR)
Designated States
Title
(EN) LINEAR DIFFERENTIAL SENSOR OF THE FOUCAULT CURRENT TYPE USED TO MEASURE SHORT DISPLACEMENTS OF A METAL PIECE
(FR) CAPTEUR DIFFERENTIEL LINEAIRE A COURANTS DE FOUCAULT SERVANT A MESURER LES PETITS DEPLACEMENTS D"UNE PIECE METALLIQUE
Abstract
(EN)
Sensor comprising two coils (1, 2) arranged within two ferrites semi-pots (3, 4) facing two non-ferromagnetic metal pieces (5, 6) of which at least one is movable. A slot generator (9) supplies the two coils through resistance (7, 8) connected to a reference potential. Two circuits (10, 11) detect the peak values of the resulting signals at the common point between the coils and the charge resistance thereof. An operational amplifier (12) does the difference between these peak values. A diode (13) allows the discharge of the coils through the resistance (7, 8). Application to pressure differential sensors, and to devices for measuring displacements.
(FR)
Capteur comprenant deux bobines (1, 2) disposees dans deux demi-pots en ferrite (3, 4) en regard de deux pieces metalliques non ferromagnetiques (5, 6) dont l"une au moins est mobile. Un generateur (9) de creneaux alimente les deux bobines au travers des resistances (7, 8) reliees a un potentiel de reference. Deux circuits (10, 11) detectent les valeurs de cretes des signaux resultants aux points communs entre les bobines et leur resistance de charge. Un amplificateur operationnel (12) fait la difference de ces valeurs de cretes. Une diode (13) permet la decharge des bobines a travers les resistances (7, 8). Application aux capteurs de pression differentielle, et aux dispositifs de mesure de deplacements.
Also published as
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